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Status |
Confirmed |
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Seminar Series |
TQM |
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Subjects |
cond-mat |
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Date |
Thursday 24 November 2022 |
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Time |
14:00 |
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Institute |
LPTHE |
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Seminar Room |
INSP Jussieu towers 22-23 room 3-17 |
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Speaker's Last Name |
Capone |
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Speaker's First Name |
Massimo |
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Speaker's Email Address |
capone [at] sissa [dot] it |
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Speaker's Institution |
SISSA Trieste |
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Title |
Competing Correlated Insulators in multi-orbital systems coupled to phonons |
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Abstract |
It is nowadays established that multi-orbital correlated materials display a number of distinctive phenomena which can be captured in terms of Hubbard models featuring the interplay between Hubbard repulsion U and the Hund’s exchange J. In this talk I will address how an electron-phonon coupling affects this picture. I will show that a Jahn-Teller coupling coexists with the Mott localization driven by the Hubbard repulsion U, but it competes with the Hund's coupling J. This interplay leads to two spectacularly different Mott insulators, a standard high-spin Mott insulator with frozen phonons which is stable when the Hund's coupling prevails, and a low-spin Mott-bipolaronic insulator favoured by phonons, where the characteristic features of Mott insulators and bipolarons coexist. The two phases are separated by a sharp boundary along which an intriguing intermediate solution emerges as a kind of compromise between the two solutions. I will finally address the stability of this scenario when doping is included. |
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